Hi just bought a big house in oct and my oil bill is alot so looking into options. House is 3600sqft its 3 floors of living without basement. I was looking into wood burning boilers but there costly and dont think I can get it into my basement cause of weight. So I'm looking into fireplace inserts not sure what's out there that will do my size home. my fireplace is 35in wide x 27in tall x 21in deep. What are some ideas to circulate air to get it to other floors I know ceiling fans. I have oil burning boiler setup for forced air hydro setup . Wondering if I put forced air unit on fan mode but it would be always on but that would only help 1st floor as 2and and 3rd floor unit are together unit is on 3rd floor